ESLint 4.8.0 discovers a lot of error related to formatting. While I
tried to fix as many of them as possible, a portion of them actually go
against our coding style. In such a case, I've disabled the indent rule
which effectively leaves it as it was before ESLint 4.8.0.

Additionally, remove jshint because it's becoming a nuisance with its
lack of understanding of ES2015+.

Reported by Manav.

The extension of the file modules/UI/side_pannels/chat/smileys.json
suggests that the format of the file is JSON. However, it contains
JavaScript RegExp instances which do not represent valid JSON. Such
discrepancies between file extension and format cause failures in
certain tools such as Webpack. Convert the file (both extension and
format) into a valid ES2015 module.

This reverts commit 93648f361b.

- equality operators
- missing/excess semicolons
- trailing whitespace